Chair structure

ABSTRACT

A chair structure has assembly portions provided on its seat for assembling with upper ends of chair legs. Button holes and a latch block are respectively provided on each chair leg and the seat for correspondingly snap fit together. Additionally, mortise holes and tenons are also provided respectively on the seat and the chair legs so that they can joint firmly together after the assembly of the seat and the chair legs. Thus, in addition to the engagement between the latch blocks and corresponding button holes, the joint strength between the seat and the chair legs can be further enhanced by the complementary fixing achieved by the joint action between the tenons and mortise holes.

BACKGROUND OF THE INVENTION

1. Field of the Invention

The present invention relates to a chair structure, more particularly toa chair structure having enhanced joint strength between the seat andthe chair legs so as to provide ease feeling and comfortable seating forusers.

2. Brief Description of Prior Art

Instead of conventional screw fastening structure, the relevantindustries have proposed a fitting structure between latch blocks andcorresponding button holes respectively provided on a seat and chairlegs, so as to avoid the disadvantages of screw-loosening due to jolt orvibration and of finding the detached screws or its substitutes foundedin the chair with screw fastening structure. However, if the flexiblelatch blocks in the conventional chair are pushed carelessly by user'shand, when user is taking the chair, the latch blocks are easily to bedetached from the button holes in such a manner that the seat might beseparated from the chair legs.

SUMMARY OF THE INVENTION

The main object of the present invention is to provide a novel chairstructure having enhanced joint strength between the seat and the chairlegs so as to provide ease feeling and comfortable seating for user.

In order to achieve above implementation object, the inventor of thepresent invention proposes the following chair structure, comprising aseat and chair legs, wherein:

the seat has assembly portions provided at the bottom thereof, eachassembly portion having a deep insertion hole provided at the bottomthereof, two button holes opposite to each other being provided on theside faces of each assembly portion and being in communication with theinsertion hole, a mortise hole being further provided between the twoopposite button holes on the side faces of the assembly portion and themortise hole being in communication with the insertion hole;

each chair leg having its upper end fitted in the insertion hole, the alatch block corresponding to the button holes of the seat being providedat the lateral side of each chair leg; a tenon corresponding to eachmortise hole of the seat being provided on the lateral side of eachchair leg and the tenon being locked with the bottom edge of eachmortise hole of the seat.

Thus, in addition to the snap fit between the latch blocks andcorresponding button holes, mortise holes and tenons joints structureare further provided in such a manner that the joint strength betweenthe seat and the chair legs can be further enhanced by complementaryfixing achieved by the joint between the tenons and mortise holes so asto provide ease feeling and comfortable seating for user.

BRIEF DESCRIPTION OF THE DRAWINGS

FIG. 1 is a perspective exploded view of the present invention.

FIG. 2 is a perspective assembled view of the present invention.

FIG. 3 is a perspective exploded view showing the second embodiment ofthe present invention.

FIG. 4 is a partial perspective enlarged view of the second embodimentof the present invention.

FIG. 5 is a sectional view the second embodiment of the presentinvention.

FIG. 6 is perspective view showing the usage state of the secondembodiment of the present invention.

FIG. 7 is sectional view showing the usage state of the secondembodiment of the present invention.

FIG. 8 is a perspective assembled view of the second embodiment of thepresent invention.

FIG. 9 is a perspective exploded view of still another embodiment of thepresent invention.

DETAILED DESCRIPTION OF PREFERRED EMBODIMENT

The objects, the technical contents and the expected effectiveness ofthe present invention will become more apparent from the detaileddescription of the preferred embodiment in conjunction with theaccompanying drawings.

Firstly referring to FIGS. 1 and 2, the chair structure of the presentinvention comprises a seat (1) and chair legs (2).

The seat (1) has assembly portions (11) provided, in equiangular manner,at the bottom thereof; each assembly portion (11) has a deep insertionhole (12) provided at its bottom face. Two button holes (13) opposite toeach other are provided on the side faces of each assembly portion (11)and the button holes (13) are in communication with the insertion hole(12), a mortise hole (14) being further provided between the twoopposite button holes (13) on the side face of each assembly portion(11), the mortise hole (14) being also in communication with theinsertion hole (12). Further, a locating portion (15) is formed on thewall surface of each assembly portion (11) at the bottom edge of themortise hole (14).

The upper end of each chair leg (2) is fitted into the insertion hole(12) provided on the assembly portion (11) of the seat (1). A flexiblelatch block (21) corresponding to the button holes (13) of the seat (1)is provided at the lateral side of each chair leg (2) to be in snap fitinto the button holes (13). Furthermore, a tenon (22) corresponding tothe mortise hole (14) of the seat (1) is provided on the lateral side ofeach chair leg (2). The tenon (22) is formed as a drop shape taperedupward from its bottom and the bottom face of the tenon (22) is lockedwith the upper end face of the locating portion (15) provided on thebottom edge of the mortise hole (14) of the seat (1).

When assembly of the chair is conducted as depicted in FIGS. 1 and 2,the upper end of each chair leg (2) is fitted into the insertion hole(12) provided at the assembly portion (11) of the seat (1), andsimultaneously the tenon (22) is allowed to align with the mortise hole(14) of the seat (1). In this manner, the chair legs (2) are easily tobe fitted into the insertion holes (12) by the design of drop shapetapered upward from the bottoms of the tenons (22). When the tenon (22)of each chair leg (2) reaches the position of the mortise hole (14) ofthe seat (1), the bottom face of the tenon (22) is locked with thebottom edge of the mortise hole (14), and in turn a rotation force isapplied to the chair leg (2) in such a manner that the tenon (22) ofeach chair leg (2) is rotated to engage with the lateral side of themortise hole (14) of the seat (1). At this moment, the bottom face ofthe tenon (22) is displaced from the bottom edge of the mortise hole(14) to the upper end face of the locating portion (15), which isextended from the bottom edge of the mortise hole (14), so that thebottom face of the tenon (22) is completely locked with the upper endface of the locating portion (15). Meanwhile, the flexible latch block(21) provided at the lateral side of each chair leg (2) is alsodisplaced to the button hole (13) of the seat (1) and is then extendedto conduct snap-fit within the button holes (13). In this manner, theassembly of the seat (1) and the chair legs (2) is completed.

When the flexible latch blocks (21) of the chair legs (2) are pushedcarelessly by an user and thus are moved to the inside of the buttonholes (13) of the seats (1), the seat (1) and the chair legs (2) canstill be kept in firm joint state by the locking between the tenon (22)of each chair leg (2) and the locating portion (15) provided at thebottom edge of the mortise hole (14) of the seat (1) under the state ofdisengagement of the latch block (21) and the button holes (13).Therefore, the chair can be maintained in good shape and is ready forcontinual use without any detachment of the seat (1) and the chair legs(2) happened.

FIGS. 3 and 4 show another embodiment of the present invention.Referring to the figures, connection sleeves (3) can be provided for thecoupling of the seat (1) and the chair legs (2). A through hole (31) isprovided at the center of each connection sleeve (3) for fitting withthe upper end of a chair leg (2). Further, two button holes (32)opposite to each other are provided on the side faces of each connectionsleeve (3). The button holes (32) are communicated with the through hole(31) and are correspondingly in snap fit with the latch block (21) ofeach chair leg (2). Further, a mortise hole (33) is provided between thetwo opposite button holes (13) on the side face of each connectionsleeve (3), the mortise hole (33) being also in communication with thethrough hole (31). Further, a locating portion (34) is formed on thewall surface of the connection sleeve (3) at the bottom edge of themortise hole (33), and the bottom face of the tenon (22) of each chairleg (2) is allowed to be locked with the upper end face of the locatingportion (34) provided on the bottom edges of the mortise hole (14) ofthe seat (1). Each connection sleeve (3) has opposite insertion strips(35) formed on the side faces thereof and one of the insertion strips(35) is formed to pass through the place where the mortise hole (33) isprovided. Correspondingly, an insertion groove (16) is provided on thewall of the insertion hole (12) of the assembly portion (11) of the seat(1) so as to fit with the insertion strip (35) of the connection sleeve(3). Corresponding fastening holes (351), (161) for the penetration of afastening member (36) are respectively provided on the insertion strip(35) of the connection sleeve (3) and the insertion groove (16) of theassembly portion (11) of the seat (1).

When assembly of the chair is conducted as depicted in FIG. 4, the upperend of each chair leg (2) is fitted into the through hole (31) of theconnection sleeve (3), and simultaneously the tenon (22) of each chairleg (2) is allowed to align with and then to be fitted into the mortisehole (33) of the connection sleeve (3), as shown in FIG. 5. Nextreferring to FIGS. 6 and 7, a rotation force is applied to the chair leg(2) in such a manner that the tenon (22) of each chair leg (2) isrotated to engage with the lateral side of the mortise hole (33) of theconnection sleeve (33). At this moment, the bottom face of the tenon(22) is completely locked with the upper end face of the locatingportion (34) provided at the bottom edge of the mortise hole (33).Meanwhile, the flexible latch block (21) provided at the lateral side ofeach chair leg (2) is also displaced to the button holes (32) of theconnection sleeve (3) and is then extended to conduct snap-fit withinthe button hole (32). Next referring to FIG. 8, after assembly of eachchair leg (2) and the connection sleeve (3), the connection sleeve (3)is force to be fitted into the insertion hole (12) with the insertionstrip (35) on the connection sleeve (3) aligning and thus locking withthe insertion groove (16) provided on the wall of the insertion hole(12) of the seat (1). At the same time, the latch block (21) extendingout of the button hole (32) of the connection sleeve (3) is in snap fitwith the button hole (13) of the assembly portion (11) of the seat (1).Simultaneously, the hole (351) on the insertion strip (35) of theconnection sleeve (3) is aligned with the fastening hole (161) providedon the insertion groove (16) of the assembly portion (11) of the seat(1), so that the fastening member (36) can penetrate through thefastening holes (351), (161) for locking the seat (1) and the connectionsleeve (3) together. In this manner, the connection sleeve (3) and theseat (1) can be assembled firmly together by the engagement between theinsertion strip (35) and the insertion groove (16), the snap fit betweenthe latch block (21) and the button hole (13), and the fastening actionby the fastening member (36). On the other hand, in addition to thefitting between the latch block (21) of each chair leg (2) and thebutton hole (32) of the connection sleeve (3), the assembly between theconnection sleeve (3) and each chair leg (2) is further enhanced by thelocking between the mortise hole (33) of the connection sleeve (3) andthe tenon (22) of each chair leg (2) with the locking joint between themortise hole (33) and the tenon (22) being embedded within the insertionhole (12) and being enclosed by the assembly portion (11) of the seat(1). Thus, the locking joint between the mortise hole (33) and the tenon(22) can be protected from detaching by outside impact. Configuring likethis, a firm assembly among the seat (1), the chair legs (2) and theconnection sleeves (3) can be ensured so as to enhance the structuralstrength and the steadiness of the whole chair structure.

FIG. 9 shows still another embodiment of the present invention.Referring to the figure, a rotating disc (4) is further pivotallyprovided on the seat surface of the seat (1). Users can change theirface orientation as desired by the provision of this rotating disc (4)without the need of standing up, moving to desired orientation and thensitting down again. Therefore, this design can significantly expeditethe operation of frequent orientation change for users in working.

What is claimed is:
 1. A chair structure, comprising a seat and chairlegs, wherein: said seat has assembly portions provided at the bottomthereof, each said assembly portion having an insertion hole provided onthe bottom face thereof, two button holes opposite to each other beingprovided on the side faces of each said assembly portion and being incommunication with said insertion hole, a mortise hole being furtherprovided between said opposite button holes on the side faces of eachsaid assembly portion and the mortise hole being in communication withsaid insertion hole; each said chair leg having its upper end fitted insaid insertion hole, a latch block corresponding to the button holes ofsaid seat being provided at the lateral side of each said chair leg; atenon corresponding to the mortise hole of the seat being provided onthe lateral sides of each said chair leg and said tenon being lockedwith the bottom edge of said mortise hole of said seat.
 2. The chairstructure as claimed in claim 1, wherein a locating portion is formed onthe wall surface of each said assembly portion at the bottom edge ofsaid mortise hole so that the bottom face of said tenon is locked withthe upper end face of said locating portion.
 3. The chair structure asclaimed in claim 1, wherein a rotating disc is further pivotallyprovided on the seat surface of said seat of said chair structure.
 4. Achair structure, comprising a seat, chair legs and connection sleeves,wherein: said seat has assembly portions provided at the bottom thereof,each said assembly portion having an insertion holes provided on thebottom face thereof; said chair legs being formed that each chair leghas a latch block, corresponding to two button holes of said seat,provided at the lateral sides thereof so as to be in snap fit with saidbutton holes of said seat, a tenon being further provided at the lateralside of each said chair leg; said connection sleeves being formed thateach having a through hole provided at the center thereof for fittingwith the upper end of said chair leg; two button holes opposite to eachother being provided on the side faces of each said connection sleeveand being in communication with said through hole, said button holesbeing correspondingly in snap fit with said latch block of each saidchair leg; a mortise hole being further provided on the side faces ofeach said connection sleeve between said opposite button holes and thebottom edge of said mortise hole being locked with the bottom face ofsaid tenon of each chair leg.
 5. The chair structure as claimed in claim4, wherein a locating portion is formed on the wall surface of each saidconnection sleeve at the bottom edge of said mortise hole, and thebottom face of said tenon of each said chair leg being allowed to belocked with the upper end face of said locating portion.
 6. The chairstructure as claimed in claim 4, wherein a rotating disc is furtherpivotally provided on the seat surface of said seat of said chairstructure.
 7. The chair structure as claimed in claim 4, wherein twoopposite insertion strips are formed on the side faces of each saidconnection sleeve and correspondingly an insertion groove is provided onthe wall of said insertion hole of said assembly portion of said seat,so as to engage with one of said insertion strips of each saidconnection sleeve.
 8. The chair structure as claimed in claim 7, whereincorresponding fastening holes are respectively provided on saidinsertion strip of each said connection sleeve and said insertion grooveof each said assembly portion of said seat, and a fastening member beingprovided to penetrate through said holes on said insertion strip and onsaid insertion groove for locking them together.
 9. The chair structureas claimed in claim 4, wherein corresponding fastening holes arerespectively provided on each said connection sleeve and each saidassembly portion of said seat, and a fastening member being provided topenetrate through said holes on each said connection sleeve and on eachsaid assembly portion of said seat for locking them together.
 10. Thechair structure as claimed in claim 4 wherein button holes opposite toeach other are further provided on side faces of each said assemblyportion of said seat, said button holes being in communication with saidinsertion hole of each said assembly portion and being in snap fit withsaid latch block of each said chair leg.